Moderate static magnetic fields enhance antitumor CD8⁺ T cell function by promoting mitochondrial respiration

Area of Science:

• Immunology
• Biophysics
• Cell Biology

Background:

• Magnetoreceptor mechanisms enable control of cell and animal behaviors using magnetic fields.
• T cells exhibit sensitivity to magnetic field exposure.
• Static magnetic fields (SMFs) offer novel therapeutic potential.

Purpose of the Study:

• To investigate the effects of SMFs on CD8+ T cell function.
• To elucidate the molecular mechanisms underlying SMF-induced T cell activation.
• To evaluate the in vivo efficacy of SMF-treated CD8+ T cells in cancer therapy.

Main Methods:

• Exposure of CD8+ T cells to moderate static magnetic fields (SMFs).
• Analysis of granule and cytokine secretion, ATP production, and mitochondrial respiration.
• Gene knockdown experiments targeting mitochondrial respiratory chain components (Uqcrb, Ndufs6) and candidate magnetoreceptor genes (Isca1, Cry1/Cry2).
• In vivo studies involving tumor-bearing mice treated with SMF-exposed T cells.

Main Results:

• SMF exposure significantly increased CD8+ T cell granule and cytokine secretion, ATP production, and mitochondrial respiration.
• Knockdown of Uqcrb and Ndufs6 inhibited SMF-induced effects, indicating the involvement of the mitochondrial respiratory chain.
• Candidate magnetoreceptor genes Isca1 and Cry1/Cry2 were identified as regulators of these mitochondrial genes.
• In vivo, SMF exposure promoted CD8+ T cell antitumor activity, repressed tumor growth, and enhanced T cell-mediated cytotoxicity.

Conclusions:

• Moderate SMFs enhance CD8+ T cell cytotoxicity through increased mitochondrial respiration.
• SMF exposure promotes the antitumor function of CD8+ T cells, offering a potential immunotherapeutic strategy.
• The study identifies key molecular players in magnetosensation within T cells.